Avoidable causes among 357 students with SVI/BL in schools for the blind in Northwest Ethiopia by age group
| Aetiology | Aged 0-15years, n (%) | Aged 16 years and above, n (%) | Total, n (%) |
| Preventable conditions | |||
| Corneal scarring | 11 (10.6) | 69 (27.3) | 80 (22.4) |
| Measles | 14 (13.5) | 64 (25.3) | 78 (21.8) |
| Vitamin A deficiency | 11 (10.6) | 39 (15.4) | 50 (14) |
| Trauma | 1 (1.0) | 8 (3.2) | 9 (2.5) |
| Ophthalmia neonatorum | 2 (1.9) | 6 (2.4) | 8 (2.2) |
| Harmful traditional practice | 1 (1.0) | 1 (0.4) | 2 (0.6) |
| Autosomal dominant | 2 (1.9) | 0 (0) | 2 (0.6) |
| Rubella | 0 (0) | 1 (0.4) | 1 (0.3) |
| Trachoma | 0 (0) | 1 (0.4) | 1 (0.3) |
| Cerebral hyopxia/injury | 1 (1.0) | 0 (0) | 1 (0.3) |
| Subtotal | 43 (41.3) | 189 (74.7) | 232 (65.0) |
| Treatable conditions | |||
| Cataract | 8 (7.7) | 14 (5.5) | 22 (6.2) |
| Uveitis | 3 (2.9) | 5 (2.0) | 8 (2.2) |
| Refractive error | 2 (1.9) | 4 (1.6) | 6 (1.7) |
| Refractive amblyopia | 2 (1.9) | 6 (2.4) | 8 (2.2) |
| Glaucoma | 2 (1.9) | 2 (0.9) | 4 (1.1) |
| Corneal scar | 2(1.9) | 2 (0.9) | 4 (1.1) |
| Vernal keratoconjunctivitis | 2 (1.9) | 0 (0) | 2 (0.6) |
| Keratoconus | 0 (0) | 1 (0.4) | 1 (0.3) |
| Brain tumour | 1 (1.0) | 0 (0) | 1 (0.3) |
| Subtotal | 22 (21.1) | 34 (13.4) | 56 (15.7) |
| Total avoidable | 65 (62.5) | 223 (88.1) | 288 (80.7) |